Door lock

Abstract

Disclosed is a lock, including a first transmission assembly, a second transmission assembly, a spindle, and a dead bolt. The second transmission assembly includes a first gear, and the spindle is connected to the first gear and the dead bolt. The first transmission assembly includes a second gear, a third gear, and a connector, the connector connects the second gear to the third gear, and the second gear is in meshed connection with the third gear. The third gear has a first position, a second position, and a third position in respect to the first gear.

What is claimed is: 
     
       1. A lock, comprising a first transmission assembly, a second transmission assembly, a motor, a spindle, and a dead bolt, wherein the second transmission assembly comprises a first gear arranged rotatably, and the spindle is connected to the first gear and the dead bolt;
 the first transmission assembly comprises a clutch assembly, the clutch assembly comprises a second gear, a third gear, and a connector, the connector connects the second gear to the third gear, and the second gear is in meshed connection with the third gear; 
 the motor is connected to the second gear and configured to drive the second gear to rotate, and the second gear is configured to drive the third gear to rotate; 
 the third gear has a first position, a second position, and a third position in respect to the first gear; 
 when the third gear is in the first position, the third gear is in meshed connection with the first gear, the third gear is configured to drive the first gear to rotate along a first direction, the first gear drives the spindle to rotate, and the spindle drives the dead bolt to move and retract; 
 when the third gear is in the second position, the third gear is separated from the first gear; and 
 when the third gear is in the third position, the third gear is in meshed connection with the first gear, the third gear is configured to drive the first gear to rotate along a second direction, the first gear drives the spindle to rotate, and the spindle drives the dead bolt to move and extend, wherein the second direction is opposite to the first direction; 
 the clutch assembly further comprises a first shaft connected to the third gear and the connector, and the third gear is configured to rotate about an axis of the first shaft; 
 the first shaft comprises an excess part located on one side of the connector that faces away from the third gear; and 
 the first transmission assembly further comprises a first limit element connected to the excess part and the connector. 
 
     
     
       2. The lock according to  claim 1 , wherein
 the first shaft comprises a flange located on one side of the third gear that faces away from the connector and connected to the third gear; and 
 the clutch assembly further comprises a first elastic element arranged between the connector and the third gear and connected to the connector and the third gear. 
 
     
     
       3. The lock according to  claim 1 , wherein the third gear is configured to drive the first shaft to rotate synchronously. 
     
     
       4. The lock according to  claim 1 , wherein the first shaft is fixedly connected to the connector. 
     
     
       5. The lock according to  claim 1 , wherein the clutch assembly further comprises a second shaft connected to the second gear and the connector, and the second gear is configured to rotate about an axis of the second shaft. 
     
     
       6. The lock according to  claim 1 , wherein
 the second transmission assembly further comprises: 
 a fourth gear arranged rotatably and connected to the first gear, wherein the fourth gear is provided with a first groove and second grooves, the first groove is concavely arranged along an axial direction of the fourth gear, and the second grooves communicate with the first groove and are concavely arranged along a diameter direction of the fourth gear and a direction away from an axis of the fourth gear, wherein the axial direction of the fourth gear coincides with an axial direction of the spindle; 
 guards arranged in the first groove and connected to the spindle and the fourth gear, wherein each of the guards comprises a bulge arranged in a manner of extending along the diameter direction of the fourth gear and the direction away from the axis of the fourth gear; and 
 second elastic elements connected to the guards; 
 wherein the guards have a first state and a second state in respect to the fourth gear; 
 when the guards are in the first state, the bulges are located in the second grooves, and the fourth gear, the guards, and the spindle are configured to rotate about the axis of the fourth gear; and 
 when the guards are in the second state, the bulges are separated from the second grooves and connected to a side wall of the first groove, the second elastic elements are in a compressed deformation state, and the guards and the spindle are configured to rotate relative to the fourth gear. 
 
     
     
       7. The lock according to  claim 6 , wherein
 the fourth gear is provided with the plurality of second grooves arranged along a circumferential direction of the fourth gear; and 
 the second transmission assembly comprises the two guards and the two second elastic elements, the two guards are symmetrically arranged with the axis of the fourth gear as a center, each of the two second elastic elements is connected to the two guards, and the two second elastic elements are symmetrically arranged with the axis of the fourth gear as the center. 
 
     
     
       8. The lock according to  claim 6 , wherein
 each of the guards further comprises a base, the bulge is arranged on the base, and the bases are connected to the second elastic elements; 
 the second transmission assembly further comprises a second limit element, and the second limit element comprises a first part and second parts connected to each other; 
 the bases are located between the first part and a bottom wall of the first groove along the axial direction of the fourth gear; and 
 the second parts are located between the bases and the side wall of the first groove along the diameter direction of the fourth gear. 
 
     
     
       9. The lock according to  claim 8 , wherein
 the second limit element comprises the plurality of second parts arranged along the circumferential direction of the fourth gear, and a gap is provided between adjacent two of the plurality of second parts; and 
 at least part of the bulge is located in the gap. 
 
     
     
       10. The lock according to  claim 8 , wherein the second limit element further comprises guide parts arranged at the first part and connected to the guards. 
     
     
       11. The lock according to  claim 8 , wherein
 the second limit element is provided with a first through hole; and 
 the spindle comprises a first limit part located in the first through hole and connected to a side wall of the first through hole, and the first limit part and the first through hole are configured to cause the spindle and the second limit element to rotate synchronously. 
 
     
     
       12. The lock according to  claim 8 , wherein
 the second limit element further comprises a detection part arranged at the first part; and 
 the lock further comprises a sensor configured to monitor an angular position of the detection part. 
 
     
     
       13. The lock according to  claim 1 , further comprising:
 a knob connected to the spindle and configured to drive the spindle to rotate; and 
 a lock cylinder assembly connected to the spindle and configured to be inserted with a key and drive the spindle to rotate; 
 wherein the lock cylinder assembly and the knob are located at two ends of the lock respectively along the axial direction of the spindle. 
 
     
     
       14. The lock according to  claim 1 , further comprising:
 a circuit board connected to the motor and configured to control the motor; and 
 a password assembly connected to the circuit board. 
 
     
     
       15. The lock according to  claim 14 , further comprising a fingerprint assembly connected to the circuit board. 
     
     
       16. The lock according to  claim 14 , further comprising a card swiping assembly connected to the circuit board. 
     
     
       17. The lock according to  claim 14 , further comprising a Bluetooth assembly connected to the circuit board. 
     
     
       18. The lock according to  claim 14 , further comprising a communication assembly connected to the circuit board.